Spring-barrel arrangement for a timepiece

Abstract

A spring-barrel arrangement for a timepiece includes a fixed plate-like component with a circular cutout. A spring barrel is rotatably mounted in said circular cutout by its corresponding circular outer contour. A barrel core is coaxially rotatably mounted relatice to the spring barrel and is enclosed by a helical tension spring. An inner end of the spring is connected to the barrel core and its outer end connected to the spring barrel. A crown wheel with a toothed ring is fixed to the spring barrel and a first wheel of a wheel train of the timepiece is fixed to the barrel core. The circular cutout is formed through the plate-like component and the spring barrel has two supporting regions which extend radially beyond the diameter of the circular cutout and are each in abutment against one of the mutually opposite side surfaces of the plate-like component.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a spring-barrel arrangement for a timepiece, including a fixed plate-like component which has a circular cutout in which a spring barrel is rotatably mounted by its corresponding circular outer contour, a barrel core which is rotatable coaxially in relation to the spring barrel, a helical tension spring having an inner end connected to the barrel core and an outer end connected to the spring barrel, a crown wheel having a toothed ring being fixed to the spring barrel, and a first wheel of a wheel train of the timepiece being fixed to the barrel core. [0003] 2. Description of the Related Art [0004] In a known spring-barrel arrangement, an annular spring barrel is mounted in a cup-shaped depression of a plate-like component. A crown wheel, which is fixed to the annular spring barrel, projects into a large step of the depression. An annular part is connected to the plate-like component ...

AI Technical Summary

Benefits of technology

[0007] An object of the present invention is to provide a spring-barrel arrangement for a timepiece which, along with high accuracy of the wheel train of the timepiece, is distinguished by requiring only a small amount of space and allows precise mounting of the barrel core as it runs down.

Problems solved by technology

Since the spring barrel is only mounted in the small step of the depression, the bearing length in relation to the diameter of the spring barrel is small, with the result that the spring barrel in the depression can tilt and jam to a considerable extent in deviation from its desired axis.

Mounting the barrel core independently of the spring barrel also results in the barrel core deviating to a considerable extent from the desired axis, which, via the first wheel of the wheel train which is connected to the barrel core, adversely affects the accuracy of the movement or clockwork mechanism.

Images